Don't panic, just go do the bloodwork.
I've had elevated bilirubin on urine strip, but all blood tests and ultrasound came back normal
And my bilirubin was waaaay off chart, the color was supposed to be white, mine was dark brown, and the leaflet said it means my liver is practically not functioning. I was crying myself to sleep for 2 days, and guess what, my liver is fine :P Those tests are good for nothing it would seem.